http://www.memory-key.com/Parents/homework.htm

Here’s a sample:

Homework demands can limit the time available to spend on other beneficial activities, such as sport and community involvement.

Too much homework can lead to students losing interest in the subject, or even in learning.

Parents can confuse students by using teaching methods different from those of their teachers.

Homework can widen social inequalities.

Homework may encourage cheating.

http://www.abc.net.au/news/newsitems/200703/s1869886.htm

Many parents lament the impact of homework on their relationship with their children. It creates arguements and pressure for both parents and children.

http://www.alfiekohn.org/teaching/rethinkinghomework.htm